Blake Griffin's MONSTER DUNK over Kris Humphries last night was so nasty ... even Blake's brother admits, you can't help but feel terrible for Kris.
Taylor Griffin -- Blake's big bro -- tells TMZ Sports he was at the Staples Center to watch the Clippers take on the Boston Celtics and watched firsthand as Blake posterized KH with a FEROCIOUS crotch-to-face throwdown.
"I just feel sorry for the guy," Taylor says ... noting that Blake's dunk was definitely one of the Top 3 slams of the year.
But don't feel that bad for Kris -- at least it seems he's winning his herpes lawsuit. So, there's that ...